Grinding machine



M. S. BENDICKSON Feb. 16, 1954 GRINDING MACHINE Filed April 22,

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GRINDING MACHINE INVENTOR. MEQLE .5. BENQ/CKSON,

BY Z

ATTOENE y.

Feb. 16, 1954 M. S. BEND-ICKSON 2,669,073

GRINDING MACHINE 3 Sheets-Sheet 3 6O Qagga 14% 760 Filed April 22, 1952 INVENTOR. 9 MEQLE 5. BENDICKSON, 9m 10$ 95% I Patented Feb. 16, 1954 50F F ICE 2,669,1173 GRINDING .MACHINE Memes: B'efldicksonjsafi Gabriel; Galif.

..-.=Application2Apri1:r22, 1952;: Serial-No 283,7 17

11 "Claims.

invention relates to apparatus .for grind- Ming 1 ta-pered joints, 1 i stop: cocksW or otherwork pieces.

An object of my invention is to provideamaichine for grinding workpieces to a predetermined shape bylmoving grinding elements axially along .Fthe.v surface of" a erotatingwwork piece; as it is rotated.

x; Another H Obj ectjof my .invention is to provide A amachine .in whichgrinding. elements are recipmate" line of :movement ,fof. a reciprocating arm :.carrying a, grindingelement. so' as to vary the size andishape 10f a .finished' articleformed by grinding a workpiece against which the grinding z'elementis pressed.

' The "foregoing and other'objects of my invention" together with various" advantages thereof may 'be' 'asce'rtaineddrom I the following" "description taken in connection-with the accompanying drawingstvherein:

Fig. l iserhorizontal-sectionalviewof a'g'r'inding machine incorporating features of my in-- '-'-vention;

I l !ig."'2"is a"longitudinalvertical sectional view ---taken on the plane 2-'-2- of-Fig. l;

Fig: 3- is an enlarged fragmentary vertical sectional view-takenon the plane 3 -3 of- Fig: 1

4- is a -'sectional transverse view taken on the plane 4- l-of" Fig; 3;

Fig;- 5 "is a. transversevertical- -sectional view -"-*takerr on "the-plane 5-5 "of'FigE 3;

Figs. 6; 7- and dare diagrams' showing relative po"si tions of-'-'various working parts of the grinding machine at variouspointsin its operation;

i Fig; 9=is a :cr'oss sectional Wiew taken on the Ti Fig; 10='isa; fragmentary longitudinal sectional -v iew-"oi? an alternative form- 0f -centering element.

Referring to the drawing; and-more particu- -larly to Figs. land 2 thereof; there is illustrated a grinding machine'incorporating :various 'features; offlmy'invention.' My' grindi-ng machine in- "eludesa pair Sofgrindingielementsgin the: tormof abrasivesblocks; llllaqa -and al 0111a mounted; at: the :rfronteendscofsdlwox corresponding: workin rzarms i i] and 11211.: that are reciprocated alon lines: that ,means such as a rubber. band .l4 encircling'the twoistraight workingarms jIZaand [2b urge these working. armspinwardly, pressingthe inner ends of the grinding elements Illa and Iflb against the outer surface of a workpiece in the general shape ,of a stop cook 16. According to my invention the two working arms I21; and [2b are reciprocated together back and forthJalong their lengths as the. work 'piece'lfi is rotated and suitable means 'are'provided for limiting the inward movement of the working arms to a predetermined ultimate jgrin ding positionin" whichthe pressure'exerted bythe'grinding elementslza'and 12b against the workpiece I 6'is relieved; --thus establishing the "'Ifinalfinished' shape ,ofthe-"stop cock'rso ground.

iIn thespecific embodiment of my invention here illustrated; a bed plate l8 and a cover '20 supportedthereon'constitute a housing for many of the working parts ofthe machine. In normal use, the-bed plate l8is laid flat upon a table 24 or other supporting surface.

provided with'a flexible wall 22 at the front end "-thereof" through which the working arms The cover is --and '-l2b project-thereby supporting the grindingelements I11a-and b externally and many of the working parts of the machine internally,

all as more specifically described hereinbelow.

"Itwill-be noted that the flexible wall 22 separates the grinding elements [0a and 10b from "*theWar-iOuS- Otherworking parts enclosed within the' housingJ This arrangement facilitates recipro'c'ation ofthe working arms I2a and E21) during i'gr-irid-ing and atthesame time minimizes leakage of grinding fluid into the housing.

Two main base plates 26a and 26b dove-tailed -to the:bed plate 18- are independently laterally movable thereon. "Two auxiliary base plates 28a "and"28bdove+tailed to the respective main base plates 26a and-28b respectively, are independently 'imovablelaterallywith respect to the correspondingrmain-base plates.

Therzlateralxmovement of the two main base plates'ifiaztandr'lfib is accomplished .bypmeans t: :ofaawpain of :coaxial'; oppositely threaded :screws 2 30agand '3-0b,:an:1intervening adjusting nut 32, and

zsgearingiafiqthat ismanipulated by means of a :and 26buare-moved byequal amounts inqpposite idirections, relative -.to the grinding axis' XX r whenrthe wheel 38- is ,turned.

llhe -movementrofa -each or" the auxiliary .base

;;plates 28w. anddllbzrelative to its corresponc'ling :taraalnelinedrtor azagrxinding axis: X-s'X. rrResilientr w-main-zbase plateaz 611 on zfibris-t accomplished by 3 means of corresponding racks 42a and 42b and corresponding engaging worms 44a and 44b. The two racks 42a and 421) are secured respectively to the corresponding auxiliary base plates 28a and 28b and the two worms 44a and 44b are rotatably mounted upon the two corresponding main base plates 26a and 26b. The two racks 42a and 421) are mounted along a common line and the two worms 44a and 44?) are coaxial, the two worms being independently rotatable by means of corresponding turning knobs 46a and 46b mounted at the outer ends of shafts 48a and 48b that extend through the housing.

To opposed rear guides 50a and 501) are mounted respectively at the rear ends of the two main base plates 26a and 26b. The left rear guide 50a. comprises two vertically spaced rollers 52a and 53a mounted upon a bracket 54a fixed to the left main base plate 26a. The left rear guide 50a also comprises an inner vertical roller 55a mounted upon an elbow bracket 5811 supported partly upon the left main base plate 26a and partly upon the bracket 54a. Likewise, the right rear guide 50b comprises two vertically spaced rollers 52b and 53b mounted upon a bracket 54a fixed to the right main base plate 251). The left rear guide 50b also comprises an inner vertical roller 56b mounted upon an elbow bracket 58b supported partly upon the right main base plate 281) and partly upon the bracket 54b.

In a similar manner two opposed front guides Sea and 601) are mounted respectively upon the two auxiliary base plates 28a and 28b. The left front guide 68a comprises two vertically spaced rollers 62a and 63a mounted upon a bracket 64a fixed to the left auxiliary base plate 28a. The left front guide 60a also comprises an inner vertical roller 66a mounted upon an elbow shaped bracket 88a supported partly upon the left auxiliary base plate 28a and partly upon the bracket 54a and likewise, the right front guide Silb comprises two vertically spaced rollers 62b and 83b mounted upon a bracket '64?) fixed to the left auxiliary base plate 28a. The right front guide also comprises an inner vertical roller 66b mounted upon an elbow bracket 6th supported partly upon the right auxiliary base plate 281) and the bracket 64b.

The left working arm I2a is mounted on the two left guides 56a and 66a passing above the two left lower rollers 53a and 63a and below the two upper rollers 52a and 62a; and also externally, that is, to the left of the two vertical rollers 56a and 66a. Likewise the right working arm I2!) is mounted in the two right guides 50b and 60b passing above the two right lower rollers 53b and 63b and below the two upper rollers 52b and 62b and also externally, that is to the right of the two vertical rollers 56b and 66b. The spacing between the horizontal rollers of each guide is just sufiicient to permit smooth horizontal movement of the two working arms therebetween.

At the rear end of each of the two working arms 12a and l 21) there are arranged slotted links a and E017. Within the slot of each of the terminals, there is arranged a corresponding pair of rollers 12a and MI), the rollers of each pair being spaced longitudinally apart on the corresponding working bar, thereby forming a gap therebetween. A reciprocating arm 14 mounted at the rear of the main base plate 58 is provided with two cross arms 16a and 16b which extend through the gaps formed by the corresponding pairs of rollers 'l2a and lit). with this arrangement, the reciprocation of the bar 14 forwardly and rearwardly causes the two working arms In and I2 b to be reciprocated in unison along their lengths.

The reciprocation of the bar 74 is accomplished by means of a reversible electric motor 18 that drives a pinion engaging a rack 82 formed at the rear end of the reciprocating bar M. Two microswitches 84 and 86 mounted beside the reciprocating bar M are provided with opposed switch elements and 8! which are adapted to be engaged by a finger 88 extending from the side of the reciprocating arm. Thus, as the reciprocating arm '14 is driven forward by the reversing motor, the finger 88 engages the working element 81 stopping the motor 88 and reversing its direction of rotation. Thereafter, during the rearward movement of the reciprocating arm 14 the finger 88 eventually engages the working element 85 again stopping the motor 18 and causing it to resume its forward movement. The circuit arrangement required to accomplish the repeated reversal of the direction of rotation of the reversible motor 18 may be of any conventional type.

With this arrangement, assuming that no work piece It is in a osition to be worked upon by the grinding elements Illa and I0?) the two working arms [2a and I21) are urged into contact with the two corresponding pairs of vertical rollers 56a, 56a and 5% and 66b thus establishing lines of movement along which the two working arms are constrained to move as the reciprocating arm 14 operates.

As shown in detail in Fig. 9, the two grinding elements lila and [0b project inwardly through gaps 90a and 9% formed between pairs of fingers 92a and 921) at the front ends of the respective working arms. Bolts 94a and 94b are arranged in the fingers to adjust the gaps therebetween and grip the grinding elements between the respective pairs of fingers. Adjustable bolts 96a and 96b arranged in brackets 98a and 98b welded to the respective working arms l2a and IE2; are adapted to position the grinding elements Illa and [0b transversely the inner working ends of the corresponding working arms I21: and i2b.

An unground workpiece I6 to be ground to a desired shape is mounted at the front of the machine between the grinding elements Ida and lllb. If the workpiece is in the form of a rough or unground stop cock, its cross arm 11 is sup ported in a clamp I00 mounted at the outer end of a rotatable shaft I02 driven by an electric motor N14. The inner end of the rough stop cock is supported by means of a centering member I06 slidably arranged upon the outer end of a horizontal shaft I08 locked by means ofa setscrew H2 in an upright support member H0 mounted upon the base l8. The centering member I06 is fastened to the outer side of the flexible wall 22 and is normally urged forward by means of a coil spring 28.

The arrangement of working arms [2a and l2b, base plates 26a, 26b, 28a and 28b and guides 54a, 54b and 64a and 64b is symmetrical about the grinding axis X-X. However, minor deviations in the lengths of the projecting portions of the grinding elements may be accommodated by manipulation of the knobs 46a and 4612.

In practice, in the course of grinding small amounts, a grinding fluid (such as a water slurry of Carborundum) is applied from time to time to the surfaceto be ground. If desired, the surface may be sprayed with such fluid from a nozzle 1 I0 and-this fluid may drip into-a pan H2 located a y nis srrangemsntane sen-sew er l uhritaht" *reaenmg'aiiewvorams pssts rdir h' piece :1 a is insertd between tnetwo 's eiemerag'ma 1 15d "10w tlie stbp 4 ab aea agamst was neutering demerit 7 locked 111' piece b 't [019' against the outerstirfaceof he wor sieceflt grinding it sown" as the o era '0 continued of the body portion to be-grbu'iidiritd s'h'ape as illustrated in Figs. 7 and 8. 'Further'more, the speed of movement-or "the working arms 12a and 12b i --50 selected relative "to the-width of the grindin elementstnat tn'e en tir v *workpiec'e is siibj'edt'ed to "c'clhtialdtwr h' f mg elements in 'eah forward-ana rearward e):- "cu'rs'i'on of the working arms.-

en me e ting elements agai-nstopposite(st r-faces .of such relativel 'nig s es and "averages-r m ninvemion' iies 'in the' iact that red artile's may-he -readilygroundiaeourately predetermined size anmsnape.

W e -I-liaveneseribed my inve non-mammabo ve' w itli partisansdeferencefitsane manu facture of stop cocks and joints havingiaconic'ail eitt'ei l ial siii fa ces it*ivill" e'ireadilymnderstdodby "th as skilled in-itl ie' art-trier itim'ay: be' readily adapted tb-thep 'fiuctlo'n ofarti'cles'zhaving surlitaces: 0 1 revolutianmf -non comcal configuration. This-may be accomplished by employing working arms that are "curved instead- :of fstrafiglitu Furt'nerm'or'e', though my? invention has 1 beeniw=de-- "scribed particular reference -:to the forming (ii -external surfa'ces 'of pl'edetermiried' shapmwit may/by suitable modification; be'a'daptedwto the "grinding of intern'al isur facesi Various other changes Which will suggest themselvesn-to ithose --slsilled the art may :therefore he madein -the material, form, details mimonstruction anddare rangement of the elements without edeparti-ng from" the ptinoip'les of my-.::invention; For sexam ple, suitable means taue'meadflymrovided :for

adjusting the length ofnthe'stroke :of the :grind ing elements 1 aand means nsuch as rchers-hare readily provided 'Jtor :vad-justingw thenposition: of 'the' bed plate relative 'to thework holdi-ngclamp. It 'istherefoiie tobe understood' that-anyv invention is not limited to the specific embodimentthereof illustrated and described hereimabutis oapable of "a wide variety offimodifications; 1 within rthe "scopet'of the: appended claims? I claim:

1. In apparatusforiigrinding .a work piece that 'is -ro'tated ahout a grinding axis-,- a pain-iof-grinding elements, means for-urging said grinding ,-elements against 'atsurface of such workpiece, means for moving fsaid fgrinding ielements'-toandufro in a plane that includes said -grinding-liaxiywhile said workpiece is so 'rotated with said "grinding elements urged -thereagainst,wandtmeans including='guide elements for limi-ting the ;=movement-of said grinding elementsa-in =-a-d-irection transverse to said"surface-whereby the pressure sof -said grinding elements-on said surface is relieved when said surface "has be'en ground to a predetermined shapes 2. In apparatus forwgri-nding a work piece that is rotated-abouta gr-i-nding axis a pair of-grinding; elements, means forflurg-ing a pairof .gr'i'nd- Workpiece-,-'-means f0l mOl illg: said'lgr indin'g elements in unisonand to and fro in aplane that ginehides said grinding axis while said workpiece is so rotated withsaid grinding v elements urged thereagainst,- and means in c1i1din'g' guide elements fonlimitingthe movemen'tof said grinding elements ina-direction transverse itoisaid'fsurface whereby the pnessuremof isaid ..grindiiig..felements on =saicl -surface is "relieved when-said ;"surface;has

been ground to a -;predetermined-shape.-

3. In apparatus for grinding a work pieeetthat ris frotated about aigrinding-aiis a -housing h aving a -them of 'bars aestendins may be predetermined.

thereon.

:through said apertured wall, means for supporting a corresponding pair of grinding elements at the outer ends of said bars, a pair of guide means within said housing for establishing an ultimate grinding position for the respective grinding elements, each of said guide means comprising two spaced limit elements for supporting the corresponding bar when fully engaged thereby in an ultimate grinding position inclined toward a grinding axis, means for urging the respective bars toward the corresponding guide means, whereby said grinding elements engage the surface of said workpiece, and mechanism including interengaged mechanical elements mounted-within said housing for longitudinally reciprocating said bars while urged toward said limit elements. 1

4. In apparatus for grinding a workpiece that isrotated about a grinding axis, a pair of grinding elements, means for urging said grinding movement of said grinding elements in a direction transverse to said surface whereby the pressure of said grinding elements on said surface is relieved when said surface has been ground to a predetermined shape.

5. In apparatus for grinding a workpiece that is rotated about a grinding axis, a pair of grind ing elements, means for urging said grinding elements inwardly against the outer surface of said workpiece on opposite sides thereof, means for moving said' grinding elements to and fro in a pla-ne'that includes said grinding axis while said workpiece is rotated with said grinding elements urged against opposite sides thereof, means including stops for limiting the movement of said grinding elements in a direction transverse to said surface whereby the pressure of said grinding elements on said surface is relieved when said surface has been ground to a predeterwhereby the size and'shape of the finished article 6. In apparatus for grinding a workpiece means including a pair of bars for supporting a corresponding pair of grinding elements respectively,

a pair of guide means engageable with the respective bars for establishing an ultimate grinding position for the respective grinding elements supported thereby, each of said guide means coinprising two spaced support elements for supporting each of the corresponding bars when fully engaged thereby in an ultimate grinding position inclined toward a grinding axis, means for urging the respective bars toward the corresponding guide means, means for supporting a workpiece in such a position as to be engaged by said grinding elements and to simultaneously hold said bars out of full engagement with said guide means, means for rotating the workpiece about the grinding axis while so supported, and means for longitudinally reciprocating said bars while said workpiece is rotated in engagement with said grinding elements, whereby said workpiece is ground to form a tapered surface of revolution 7. In apparatus for grinding a workpiece that is'rotated about a grinding axis; a basaa pair of rear guide means each including upper and lower rollers and an inner vertical roller mounted on said base on opposite sides of the grinding axis, a pair of front guide means each including upper and lower rollers and a vertical roller mounted on said base on opposite sides of the grinding axis, a painof bars each mounted between upper and lower rollers of corresponding front and rear guide means on opposite sides of the grinding axis, means for mounting a pair of grinding elements at thefront ends of the respective bars, means for laterally urging the respective bars toward vertical rollers on the corresponding guide means, andmeans for longitudinally reciprocating said bars while urged toward said vertical rollers.

' 8. In apparatus for grinding a workpiece that is rotated about a grinding axis, a base, a pair of rear guide means each including upper and lower rollers and an inner vertical roller mounted on said base on opposite sides of the grinding axis, a pair of front guide means each including upper and lower rollers and an inner vertical roller mounted on said base on opposite sides of the grinding axis, a pair of bars each mounted between upper and lower rollers of corresponding front and rear guide means on opposite sides of the grinding axis, mounting means for projecting a pair of grinding elements inwardly at the front ends of the respective bars, means for laterally urging the respective bars inwardly toward vertical rollers on the corresponding guide means, and means for longitudinally reciprocating said bars while urged toward said vertical rollers.

9. in apparatus for grinding a workpiece, a pair of bars, means for supporting a corresponding pair of inwardly projecting grinding elements on the respective bars, a pair of guide means for establishing an ultimate grinding position for the respective grinding elements, each of said guide means comprising two spaced support elements for supporting each of the corresponding bars .when fully, engaged thereby in an ultimate grinding position inclined toward a grinding axis, means for urging the respective bars inwardly toward the corresponding guide means, means for rotating the workpiece about the grinding axis while so supported, means for supporting a workpiece between said grinding elements with said bars out of full engagement with said guide means, and means for longitudinally reciprocating said bars while said workpiece is rotated in engagement with said grinding elements whereby said workpiece is ground to form a tapered surface of revolution thereon.

10. In apparatus for grinding a workpiece that is rotated about a grinding axis, a bed plate, a pair of main base plates laterally movable on said bed plate transverse-to the grinding axis, a pair of auxiliary base plates laterally movable on the respective main base plates transverse to the grinding axis, a pair of rear guide means mounted on opposite sides of the grinding axis, each rear guide means including a rear stop mounted on the respective main base plates, a pair of front guide means mounted on opposite sides of said axis, each front guide means including a front stop mounted on the respective auxiliary base plates, a pair of bars each operatively mounted between corresponding front and rear guide means on opposite sides of the grinding axis, means for laterally adjusting the position of eachauxiliary base plate relative to the corresponding main base, plate, whereby the inclination ofeach bar relative to the grinding axis may be adjusted, means for mounting a pair of grinding elements at the front ends of the respective bars, means for laterally urging the respective bars' toward stops on the corresponding guide means, and means for longitudinally reciprocating said bars while urged toward said stops.

11. Apparatus for grinding a workpiece that is rotated about a grinding axis, a bed plate, a pair of main base plates laterally movable on said bed plate transverse to the grinding axis, a pair of auxiliary base plates laterally movable on the respective main base plates transverse to the grinding axis, a pair of rear guide means mounted on the respective main base plates on opposite sides of the grinding axis each of said rear guide means including upper and lower rollers and an inner rear vertical roller, a pair of front guide 'means mounted on the respective auxiliary base plates on. opposite sides of the grinding axis, each of said rear guide means including upper and lower rollers and an inner front vertical roller, a pair of bars each mounted between upper and lower rollers of corresponding front and rear guide means on opposite sides of a 10 longitudinal grinding axis, means for laterally adjusting the position of each auxiliary base plate relative to the corresponding main base plate, whereby the inclination of each bar relative to the grinding axis may be adjusted, means for mounting a pair of inwardly projecting grinding elements at the front ends of the respective bars, means for laterally urging the respective bars toward vertical rollers on the corresponding guide means, and means for longitudinally reciprocating said bars while urged toward said rollers.

MERLE S. BENDICKSON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,509,836 Haldeman et al. Sept. 30, 1924 1,536,928 Reitz May 5, 1925 2,154,681 Jefiries et a1. Apr. 18, 1939 2,244,806 Schmidt June 10, 1941 FOREIGN PATENTS Number Country Date 619,372 Germany Sept. 28, 1935 

